Saw-tooth setting device



OCL7, 1947. i I 'Q G, WAHLSTRQM 2,428,439

.SAW TOQTH- SETTING DEVICE Filed May 1o, 194e Patented Oct. 7, 1947 UNITED STATES vPATENT OFFICE 5 Claims.

This invention relates to a saw tooth settingy device and it consists in the constructions, arrangements and combinations herein described and claimed.

It is a particular object of the invention to provide a saw tooth setting device in which a pair of saw teeth are simultaneously set through a single operation of the device, each tooth being equally offset with respect to the longitudinal axis of the saw body.

It is also an object of the invention to provide a saw set that will advance itself along a saw, as soon as a pair of teeth have been set.

It is a still further object of the invention to provide a saw tooth setting device in which the tooth engaging members may be quickly and readily adjusted to accommodate different sizes of teeth of saws, as well as controlling the degree of setting of the teeth of a saw.

It is also an important object of the invention to provide a device which is of simple construction, of relatively few parts and which may be operated by a workman of ordinary skill.

Additional objects, advantages and features of invention will be apparent from the following description and accompanying drawing, wherein Figure 1 is a perspective view of the device.

Figure 2 is a vertical sectional view thereof.

Figure 3 is a cross section on the line 3-3 of Figure 2.

There is illustrated a frame structure I consisting of a pair of vertical spaced walls II connected and enlarged inwardly of the lower ends thereof, as indicated at I2. A longitudinal channel I3 is formed in the lower end of the frame having .an inner dove-tailed portion I4, permitting passage of the angularly set teeth of a saw when disposed in the channel.

Extending through the enlarged portion I2 of the frame there is an annular bore I5 within which there is oscillatably seated a barrel I6, the outer end thereof being formed with a plate I1 disposed at right angles to the barrel and occupies a position snugly against the forward end i of the bore I5. The lower end of the plate I1 is formed with a tooth-engaging lug I8, the upper part being extended upwardly and provided with a pivot pin I9 inwardly of its extremity, for a purpose presently to be explained.

A barrel 20 is oscillatably seated within the barrel I6 and is formed with .a plate 2| similar to the plate I1 including a lug 22, but instead of the pin I9 an aperture 23 is formed. In addition, however, the plate 2I has a threaded opening 24 intermediate the length thereof for reception of a thumb screw 25, the inner end of which engages the plate I'I for the purpose of adjusting the positions of the tooth-engaging lugs I8 and 22, as will be explained more fully hereinafter.

Between the walls Il at an upper rearward 2 position an operating lever 26 is rockably mounted upon a pin 2, the lever lying snugly between the walls so as to prevent lateral oscillations. The forward ends of the walls Il are curved upwardly, as at 28, and function as stops limiting the downward movement of the lever 2t. The lever 26 is formed with a vertically extended threaded bore 29 in which there is engaged a threaded stem 3i? of an impact knob 3i, The stem 3D has a thumb nut 32 thereon adjustable so as to limit downward movement oi the lever. -It will be understood that by turning the knob 3I so as to move the stem upwardly out of the bore 29, the thumb nut may be adiusted alo-ng the stem to a desired position. Thus when the lever 2 is moved downwardly the nut 32 will engage the upwardly curved portions 28 of the walls and stop further movement of the lever.

rIhe lever 25 is formed with a forwardly extended bearing 33 engaged in a sleeve t@ of a link 35, the latter having its opposite end apertured for reception of thepin i9 of the plate il. The sleeve 3ft is of substantial length and pivotally mounts a link 36, the latter having a pin 3l for projection through the opening 23 of the plate 2 I.

The plates ll and 2l are arranged in tandem relation, the upper ends diverging from the vertical axis through the frame, and in order that the lower ends'of the plates may be brought into close contacting relation, as will be required in the Setting of small saw teeth, the upper ends of the plates are olset in opposite directions as indicated at 38, which also allows proper movement of the links 35 and 36.

The barrels IS and 2B are approximately onehalf the length of the bore I5 so as to afford ample support thereof and extended through the barrel 23 there is a rod 35i, the forward end being provided with a hook eli having a downwardly presented tooth 4I adapted to progressively engage the teeth of a saw being set. The rod 39 is preferably enlarged toward its rear end which is formed with a threaded bore 42 for reception of a set screw 3, the latter mounting a plate 44 complemental to the bore I5. A helical spring i5 encircles the rod 39, one end thereof seating against a shoulder 45 while the other rests against the plate M. The spring i5 draws rearwardly upon the rod and likewise upon the hook d. The tension of the spring i5 may be adjusted by means of the screw d3.

In order that a progressive movement may be imparted to the hook 40, a bell crank lever M5 is rockably mounted between the plates l! by means of a pivot pin lil, one arm i3 lying beneath and substantially parallel to the lever 26, while the other arm it extends downwardly at right angles thereto. The arm lig is provided with a vertical bore 5i! and receives a sleeve 5I the lower end of which is closed and provided with a lug ward pressure upon the sleeve to hold the lug-v 52 engaged' with the slot of the rod 39.

In order that the lug 52 may be operatively connected with the rod 39, the upper interior` wall 55 of the enlarged portion I2, and each-of the barrels i and 20 are slotted as at 56, the

slots being of such width as to permit oscillation of the barrels as will be required. in operation', .f

of the device.

The operating lever 2t is provided with a plu-lv rality of threaded openings 5'! spaced longitudinally. thereof adapted to selectively receive' a thumb'screw E8. It will be apparent that the thumb screw 58 may be engaged in either of the openings and by adjustment toward or away from the arm 48, the degree oftravel of the rod,

39iand associated hook El@ may be regulated. i

The operation of the set is substantially as follows: With the saw suitably supported in a viseor otherwise with teeth presentedupwardly,

the' device is'presented thereto, the teeth-passing,

upwardly through Athe slot i3. As shownv in Figure 2, the lugs i8 and 22 have been adjusted for setting teeth of a small toothed saw, each lug being arranged in opposed relation to a tooth ofthe saw. By imparting a blow tothe knob 3| the lever 26 will swing downwardly, imparting outward opposite movement to the levers35 and 35 andv since these levers are pivotally connected to respective plates l l and 2l these plates will be moved in opposite directions transversely of the teeth of the saw, and since the lugs I8 and 22 engage respective teeth, they will be forced laterally to provide the properset to the teeth, the degree of offset of the teeth being vde- Y termined by the setting of the thumb nut 32' and its.'engagementV withv elevated portions 28 of the plates Il.

As thelever 25 descends andthe associated parts are motivated, a rocking movement will be imparted to the bellcrank 45 through thumb screw 53which eects a forward movement of` the rod 39a distance of two teeth so that theY tooth ll of the hook will be in position to engage the proper tooth to advance the saw set upon re turn of the parts to normal position. Y

In `order to adjust the plates il and 2i to pre-` sent thetooth-engaging lugs in spaced relation' so .as to be operative upon larger toothed saws, it-is.only necessary to tighten the thumb screw 25; which will Ymove plate 2l forwardly from the plate i7 a proper distance. 58fis. adjusted for the proper length of travel of the-rod-SS'and the tension of the spring 45 may alsoibe adjusted.V

While I have shown and specifically described apreferred construction, this is by way of illustration only, and I consider as my own all such modifications in construction as fairly fall wthr inthescopeV of the appended claims;

Iclaim:

1. In a saw tooth setting device a frame'having parallel upright walls connected and enlarged intherethrough, the lower end of said frame hav--v The thumb screwv ing .1a-longitudinal dove-tail slot, a pair of plates Varranged in tandem relationand oscillatably mounted on the front end of the frame, each plate having a tooth-setting lug upon its lower end traversing a, path transverse of said dove-tail slotfa rocka'ble' lever mounted between said walls cably mounted in the annular bore of the body and extending forwardly of said plates, spring means associated with the hook for holding thek latter. in a rearward position, link and lever means operatively engaged between said rockable lever and said hook memberforadvancing the latter a, distance of two saw'teeth against the expand-- ingaction ofA said spring. Y

2. The structure of claim l in which-ianf-ad justing means is provided between the rockable lever and the link and lever means to vary the forward movement of said hooky member. y

3. In a saw tooth setting device a frame 'having parallel upright walls, the lower edge'ofthe frame having a dove-tail slot'V extending longitudinally. thereof, an annular longitudinal: bore.Y being vformed in said body aboversaidslot and extending parallel therewith, abarrel oscillatably mounted` in one end ofV said bore, saidbarrelhaving,V a plate at-saidrend of the bore extendingY upwardlyl and-divergent to the vertical axis -of the frame,y

the lower Yend of the plate having a sawtooth-en- .A Y

gaging lug, a barrel oscillatably` mounted inthe rst barrel and having aplate in tandem rela;1 tion to the first` plate. and extending upwardly and divergent in the opposite direction'to the= rst plate, a rockable lever mounted between said walls, the free-end extending toward. said-plates,

Va pair of link membersV connected-to saidiree tween saidr walls andpositionedto present one arm..

beneath said rockable lever, said-rockable lever having a plurality vof'v longitudinallyspaced.; threaded openings, a threaded thumb. screw en-` gageable selectively in .saidpenings for Vlbearing contact with said arm of the-.bell 'crank lever,.v the other -arm of the bell lcrank-.lever beingroperatively connected to the shank ofthe hook. mem.- ber toeiect forward movement ot the hookmem-f ber under downward movementpffthe .rockableM leverand an impact knobfhaving an adjustable.. stop engageable with said side vwalls.A

4. Thestructure ofl claim 3,: in whichmthes-s'ece.

ond namedplate has:` a vthreaded .thumbscrew adapted to engage ether rst platettoY adjust the@ tandem spacing.betweensaidplates.-

5. Thestructure of claim 3.in.whichl thelfsecond named arm of 'the-bell crank lever1 incindesa spring-pressed telescopingsleeve, ysaid sleeveA having a tongue and saidishank havinga slot fori. reception of said tongue.

CHARLES omWAHI-lsfri,tot/La.mi 

